Try-square.



PATENTBD MAY 7, 1907. lR. A. BRBUL. TRY SQUARE. APPLICATION FILED APB.26, 1906.

, rus Nomus Psr'sns co., WASHINGTON, n. c,

UNIT STATES FFIUE.

arnfr ...i

TRY-SQUARE.

Specification of Letters Patent.

Patented May '7, 19,07.

Application filed April 26,1906. Serial N0. 313,772.

To @ZZ wiwi/n, it ntcty concern,.-

Be it known that I, RICHARD A. BRE'UL, a citizen of the United States,and a resident of Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements in Try-Squares, of which the following is a specification.

My invention relates to an improvedl square and belongs to that classof` squares having an adjustable blade for laying out both right angleandbevel lines.

It is the object of my invention to produce an all steel square, of theabove class, with an improved form of back to which the blade ispivoted; to provide a square which can be used both as a try square or abevel square with means for adjusting the blade and locking it invarious positions representing different degrees of a circle; to providemeans whereby the blade may be quickly set and fixed in any particularposition desired, and finally to design it in such a manner as to permitof its manufacture from sheet metal, which can be inexpensively stampedou and struck up to form the several parts ready for assembling.

Referring to the accompanying drawings forming a part of thisspecification similar characters of reference denote like orcorresponding parts throughout the several figures and of which,

Figure 1, shows a side elevation of a square embodying my improvements,the blade being also shown in a shifted position, by dotted lines. Fig.2, is a top edge or plan view of the square shown in Fig. 1. Fig. 3, isa detached plan view of the lifting lever shown in Figs. 4 and 5. Fig.4, is a back edge view of the square shown in Figs. 1 and 2. Fig. 5, isa similar back edge view of the square, the blade being shown in aninclined position. Fig. 6, is a detail side elevation of the inner endportion of the blade. Fig. 7, shows an end, and a central verticalsectional view of the sheet metall stud attached to the blade and bymeans of which it is pivotally connected to the back. Fig. 8, shows afragmentary side elevation of the upper portion of the back and innerend'of the blade, in an adjusted position, with a slightly modified formof locking device.

Referring in detail to the numerals of reference marked upon thedrawings, 10 indi eates a blade which maybe graduated in the usual orany preferred manner, and which obviously contains an upper and lowerstraight edge, along which lines may be drawn as in the marking out ofwork.

11 indicates the back of the square which may be formed of sheet steelslightly heavier than that of the blade. The two vertical edges of thisback are deflected in op osite directions at a right angle to the back),one forming the outer edge 12 and the other an inner edge 13 parallelwith the outer edge, either of which may be used against one edge of thework, while laying out angular lines with relation thereto. The upperportion of the back 11 is provided with a round hole 14 through 'whichthe cylindrical portion 15 of the stud 16 is pivoted and operates in theshifting of the blade. The stud is further provided with a squareportion 17 which in practice is seated in the square hole 18 in theinner end of the blade in a manner to rigidly secure the parts together.The stud further contains a flange 19 one face of which lays up flushagainst the back of the blade when the parts are assembled. The innerreduced square end portion 20 of the stud 16 engages a correspondingsquare hole in the swinging arm 21 attached thereto. In practice theextremity of this small end of the stud is laid back over the face ofthe arm 21 as indicated in the several figures, to firmly secure theparts together, it being obvious of course that both the blade and armthus become rigidly fixed to the shouldered portions ofthe stud, Whilethe cylindrical portion of said stud is free to turn within the holey 14of the back, thus allowing the blade to be adjusted from the right angleposition shown in Fig. 1, to any intermediate angular or bevel positiondesired, as indicated by the dotted lines of the blade shown in Fig. 1.The inner end of the blade is cut away as at 22 to accommodate the upperportion of the fiange 12 of the back, and is further provided with ashoulder 23 which in practice is seated upon the top edge of said ange12 when the blade is disposed at a right angle to the back, as shown inFig. 1.

IOO

To the front side of the back I attach by I means of a screw 24 a springplate 25, the upper end of which is cut away to form a circular seriesof teeth 26 which in practice are engaged by the toothed end 27 of thearm 21 the normal tendency of the upper end of this spring plate is tolay up close to the back as indicated in Fig. 4. A pocket 28 is formedon the under side of the plate and is provided IOS IIO

with a hole 29 through which a lifting lever 30 is operated. Said leveris preferably formed of sheet metal and contains trunnions 31 which inpractice lay transversely across the pocket intermediate of plate andback in a manner to hold the lever in place at t all times ready foroperation. The said parts are so constructed and proportioned as topermit of the springplate assuming its normal position' close againstthe back, -in engage'inent with the tooth 27 of the arm 21, when thelever is in a closed osition as shown in Fig. 4, and to insure saidplate being withdrawn from the engagement of said arm, when the lever isdisposed at a right angle, as shown in Fig. 5. This latter positionofthe lever obviously permits of the free adjustment of the blade andarm to any position desired and provides a convenient and quick form oflock to retain said parts in such adjusted position. As designed in Fig.1, each of the teeth represent tive degrees, which permit of the bladebeing adjusted and locked in a position indicating any degree of auarter circle which is a multiple of ive. W 'le the construction shownin Fig. 8 conh tains a finer toothed edge, which obviously would allovirthe blade to be adjusted liner and to positions representing any degreedesired. The arm 21 may contain one or more teeth 27 as shown, the upperportion of the teeth being preferably beveled or cut away as shown at 22in Fig. 1, to insure a more positive and quicker engagement of thespring plate with the arm, as is obviously ap arent.

{aving thus described my invention what I claim and desire to secure byLetters Patent is 1. In a square of the class described, the combinationof a back, a bladepivotally connected thereto, a toothed arm connectedwith said pivotal blade, a spring plate attached to the back and havinga series of teeth to engage the teeth of the arm, and means to engageand disengage the plate i .from such arm.

` gage and disengage the plate from such arm.

3. In a square of the class described, the combination of a back, ablade pivotally connected thereto, a toothed arm connectedwith saidpivotal blade, a plate attached to the back having a circular series ofteeth to engage the yteeth of the arm, and a lever to engage and operatethe plate to disconnect it from the arm to permit of the adjustment ofsaid arm and plate; t

4. In a square of the class described, the combination of a back, a studpivoted in the back, a blade secured to the stud at one side of theback, an arm secured to the stud at the other side of the back, a springplate attached to the back, having a circular series of teeth to engagethe teeth of the arm, and

means to engage and disengage the plate from such arm.

5. ln a square, the combination with a blade, of a back connectedtherewith having its outer edge deileoted in one direction and the inneredge deflected in the opposite direction said edges forming flangesalong the entire length of the back, the said inner flange arranged toextend both above and below the inner edge of the blade.

6. In a square of the class described, the combination with a back, ablade pivotally connected thereto, an arm connected with said bladebearing a tooth having a beveled top edge, a spring plate attached tothe back having a circular series of teeth to engage the beveled toothof the arm, and means for operating the spring plate to engage anddisengage saidplate. l

7. The combination in a s uare, of a back, a blade pivotally connected tereto, a spring plate to hold the blade in dilierent positions, a leverpivoted in a pocket of the plate, and adapted to be operated to lock andunlock vthe blade.

8. In a square of the class described, the hcombination with a back andblade, of a stud pivotally connecting the two, and comprising Fair ield,and State of Connecticut, this 25th day of April, D., 1906. t

RCHARD A. BREUL.

Witnesses:

C. M. NEWMAN, RUTH RAYMOND.

IOO

IOS

